package com.sprint.gulimall.product.service.impl;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sprint.common.utils.PageUtils;
import com.sprint.common.utils.Query;

import com.sprint.gulimall.product.dao.CategoryDao;
import com.sprint.gulimall.product.entity.CategoryEntity;
import com.sprint.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService
{

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
         //查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //组装成复制的树形结构

        //找到所有的一级分类
        //两种写法  () -> {}
        //List<CategoryEntity> Level1Menu = entities.stream().filter((categoryEntity) -> {
        //    return categoryEntity.getParentCid() == 0;
        //}).collect(Collectors.toList());

        List<CategoryEntity> Level1Menu = entities.stream().filter((categoryEntity) -> categoryEntity.getParentCid() == 0)
                .map((menu)->{
                    menu.setChildren(getChildren(menu,entities));
                    return menu;
                })
                .sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())- (menu2.getSort()==null? 0:menu2.getSort());
                })
                .collect(Collectors.toList());

        return Level1Menu;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //todo 1、检查当前删除的菜单是否存在引用

        //逻辑删除
        baseMapper.deleteBatchIds(asList);
    }

    //获取菜单的所有子菜单信息,递归查找
    private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> all)
    {
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //1.找到子菜单
            categoryEntity.setChildren(getChildren(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //菜单排序
            return  (menu1.getSort()==null?0:menu1.getSort())- (menu2.getSort()==null? 0:menu2.getSort());
            }).collect(Collectors.toList());
        return children;
    }
}